Watch: Astronauts Sunita Williams and Butch Wilmore Break Silence After Returning to EarthButch Wilmore is clocking out for good. Four months after the NASA astronaut and his colleague Sunita "Suni" Williams returned from their eight-day-turned-nine-month space mission, the 62-year-old has officially retired. "After 25 years at NASA, flying in four different spacecraft, accumulating 464 days in space," NASA wrote in an August 6 press release, "astronaut and test pilot Butch Wilmore has retired.